alt Hacker Newsfor an interesting reversal of the "problem" of the speed of light, IEX is a stock exchange design to combat HFT by adding a physical speed bump by way of 38 miles of fiber optic cable. The general idea being to level the playing field and improve market liquidity using physical communication limits of light. https://en.wikipedia.org/wiki/IEX
That marketing gimic adds hundreds of microseconds to order latency. It’s not designed to level any playing fields it’s designed to get publicity.